It seems reasonable to conclude that surgery is not only called for by signs of progress of the pathological conditions to a wider and more severe degree, but that it is also of value to intervene when a case is judged to have a lesion which has remained static since its initiation by the original trauma. It is suggested that the more frequent use of inspection holes in properly selected cases will lessen the incidence and severity of that bugbear of head injuries, the so-called post-concussional syndrom or post-traumatic encephalopathy.